Officials from the Centers for Disease Control and Prevention (CDC) in the United States warned about the potential for monkeypox to spread for some time without being detected, following a genetic analysis of recent cases that identified two different strains of the virus. According to "Medical Express," Jennifer McQuiston, a health official at the CDC, stated: "There is a need to analyze multiple infections to determine how long monkeypox has been spreading within the United States." She added, "I believe it is likely that there are cases of the disease that have not been on the radar before, but not to a significant extent." Professor Angela Rasmussen, a virology expert at the University of Saskatchewan, noted that "these findings suggest that it may be difficult to contain the outbreak, as it is unclear when and where the infections occurred, and some types of infections may be misdiagnosed as something else." Data on monkeypox infections worldwide indicates that it is no longer endemic in parts of Africa, although it is a disease that does not spread easily. The disease generally begins with flu-like symptoms and swollen lymph nodes, followed by a rash on the face and body.